This paper summarized the biosynthetic and storage position,transport pathway,regulatory factors,key synthase,and gene encoding of flavonoids.Flavonoids have defensive functions and can improve plant′s resistance to adverse environment.Varieties and contents of flavonoids are often determined by genetic characters of plants,and influenced by the environmental factors.The contents of plant flavonoids can be increased by changing genes or their growing conditions.It is not so clear about the signal molecules in the regulatory pathways,mechanism of transcription factors and proteins.Further studies should be carried out on functional genes and proteome relevant to flavonoid biosynthesis.